Diamond turning and full-frequency band error measurement methods for x-ray focusing mirror molds

Kaiji Wu; Xingyu Bao; Fei Ding; Zheng Qiao; Zhigao Chen; Duo Li; Yutao Liu; Jiadai Xue; Wei Wang; Yanting Li; Jinliang Wang; Qiuyan Liao; Yuan Jin; Yangong Wu; Niandong Zhang; Peng Ji; Guo Li; Yuhao Li; Wensong Chai; Yanji Yang; Bo Wang

doi:10.1117/12.3004925

29 December 2023 Diamond turning and full-frequency band error measurement methods for x-ray focusing mirror molds

Kaiji Wu, Xingyu Bao, Fei Ding, Zheng Qiao, Zhigao Chen, Duo Li, Yutao Liu, Jiadai Xue, Wei Wang, Yanting Li, Jinliang Wang, Qiuyan Liao, Yuan Jin, Yangong Wu, Niandong Zhang, Peng Ji, Guo Li, Yuhao Li, Wensong Chai, Yanji Yang, Bo Wang

Author Affiliations +

Proceedings Volume 12976, Eighth Asia Pacific Conference on Optics Manufacture and Third International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2023); 129760E (2023) https://doi.org/10.1117/12.3004925
Event: 8th Asia Pacific Conference on Optics Manufacture & 3rd International Forum of Young Scientists on Advanced Optical Manufacturing, 2023, Shenzhen, China

Abstract

Temporary sources and explosive celestial bodies in the universe can only be observed through their high-energy radiation, for example X-rays. The multilayer nested Wolter-I type focusing mirror is widely used in X-ray astronomical telescopes. The electroforming replication process can achieve batch high-precision production of Wolter-I type focusing mirrors, with the process flow of mold ultra-precision turning, ultra-smooth, coating, electroforming, and demolding. The fabrication of molds accounts for a large proportion in the process, and the molds accuracy and surface quality directly determine the optical performance of the mirrors. We built the DRL2000 ultra-precision lathe for mold turning of mission EP (Einstein Probe) and eXTP (enhanced X-ray Timing and Polarimetry mission). The swing straightness error of the guide rail was separated and compensated through trial cutting and reverse measurement methods to achieve a turning generatrix accuracy of peak-to-valley (PV)<0.2μm. An in-situ measurement device has been built based on the ultra-precision lathe. After adjustment the system measurement error can be controlled within 0.1μm. The corresponding spiral measurement path and coaxiality error separation method were studied and verified through experiments. An offline measurement device was built and based on it, an optical lever measurement method was preliminarily validated. Finally, a division method of medium-low frequency error and medium-high frequency error was proposed.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Kaiji Wu, Xingyu Bao, Fei Ding, Zheng Qiao, Zhigao Chen, Duo Li, Yutao Liu, Jiadai Xue, Wei Wang, Yanting Li, Jinliang Wang, Qiuyan Liao, Yuan Jin, Yangong Wu, Niandong Zhang, Peng Ji, Guo Li, Yuhao Li, Wensong Chai, Yanji Yang, and Bo Wang "Diamond turning and full-frequency band error measurement methods for x-ray focusing mirror molds", Proc. SPIE 12976, Eighth Asia Pacific Conference on Optics Manufacture and Third International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2023), 129760E (29 December 2023); https://doi.org/10.1117/12.3004925

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